netdev - Re: [patch net-next-2.6] vlan: introduce ndo_vlan

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Message-ID: <CAHXqBFKMFxDYo6yz_59PHEm4kn37iy3jk3YVpcyE6KY-nzCRbQ@mail.gmail.com>
Date:	Tue, 19 Jul 2011 10:27:32 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	shemminger@...ux-foundation.org, eric.dumazet@...il.com,
	greearb@...delatech.com
Subject: Re: [patch net-next-2.6] vlan: introduce ndo_vlan_[enable/disable]

W dniu 19 lipca 2011 10:24 użytkownik Michał Mirosław
<mirqus@...il.com> napisał:
> W dniu 19 lipca 2011 10:13 użytkownik Jiri Pirko <jpirko@...hat.com> napisał:
>> Tue, Jul 19, 2011 at 09:24:29AM CEST, mirqus@...il.com wrote:
>>>W dniu 18 lipca 2011 09:13 użytkownik Jiri Pirko <jpirko@...hat.com> napisał:
>>>>  static u32 atl1c_fix_features(struct net_device *netdev, u32 features)
>>>>  {
>>>> +       u32 changed = netdev->features ^ features;
>>>> +
>>>> +       /*
>>>> +        * Since there is no support for separate rx/tx vlan accel
>>>> +        * enable/disable make sure these are always set in pair.
>>>> +        */
>>>> +       if ((changed & NETIF_F_HW_VLAN_TX && features & NETIF_F_HW_VLAN_TX) ||
>>>> +           (changed & NETIF_F_HW_VLAN_RX && features & NETIF_F_HW_VLAN_RX))
>>>> +               features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
>>>> +       else
>>>> +               features &= ~(NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);
>>>> +
>>>
>>>You ignored my hint about combined TX/RX offload. Is that on purpose?
>> Sorry but I'm probably missing what you mean.
>
> You could replace above code with:
>
> if (!(features & NETIF_F_HW_VLAN_RX))
>  features &= ~NETIF_F_HW_VLAN_TX;

Or you could invert the test and effect:

  if (features & NETIF_F_HW_VLAN_TX)
    features |= NETIF_F_HW_VLAN_RX;

Best Regards,
Michał Mirosław
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